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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
February 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. certificate)
Type of method:
isoteniscope
Temp.:
25 °C
Vapour pressure:
481 Pa
Key result
Temp.:
20 °C
Vapour pressure:
368 Pa
Conclusions:
The Vapor pressure of Lime Oxide has been determined to be 481 Pa at 25°C using the isonesticope method.

Description of key information

For the purpose of environmental exposure assessment, the vapour pressure of 481 Pa is assigned to both assessment entities. Although this value was obtained from an experimental study on the multi-constituent registration substance itself, QSAR predicted values for the individual components indicate that the two types, monoterpene ethers and unsaturated monoterpene hydrocarbons, are expected to be of similar volatility.

Key value for chemical safety assessment

Vapour pressure:
368 Pa
at the temperature of:
20 °C

Additional information

The Vapor pressure of Lime Oxide has been determined to be 368 Pa at 20° and 481 Pa at 25 °C using the isonesticope method.

Vapour pressure is a key physico-chemical property for modelling exposure estimates (work, consumer and environment). For the environment exposure assessment, two assessment entities have been defined because of significant differences in other physico-chemical/fate properties such as water solubility, Kow and Koa. The vapour pressure of the two types of components was estimated by QSAR using the Mpbpwin V1.43 module available in EPI suite. The results for the main consituents are provided in the table below. For two of the constituents, experimental data was also available in the EPI suite database.

Main Constituent

CAS

Component Type

Vapour Pressure

Estimation

(25 deg C)

Experimental

Database match

p-mentha-1,3-diene

99-86-5

Hydrocarbon

222 Pa

-

p-mentha-1,4-diene

99-85-4

Hydrocarbon

153 Pa

145 Pa

p-mentha-1,4(8)-diene

586-62-9

Hydrocarbon

133 Pa

99 Pa

(E)-tetrahydro-2,2-dimethyl-5-(1-methyl-1-propenyl)furan

56058-69-6

ether

158 Pa

-

The constituent information in the table above shows that both types of components, unsaturated monoterpene hydrocarbons and monoterpene ethers, are expected to be of similar volatility. Thus it was considered appropriate to use measured value for the whole substance, for both assessment entities.